Improvement in jacqttard-mechanism for looms



NPETEES. PHOTO-LITHOGRAPNER, WASHINGTON. C.

-ttitrd time @tutti (attire.

EZEKIEL K. DAVIS, OF NEW YORK, N. `Y., ASSIGrNOlt TO DUCKWORTH @L SONS,Oli'l PITTSFIELD, MASSACHUSETTS.

Letters Patent No. 96,553, dated November 9, 1869.

IMPROVEMENT IN JACQ'UARD-MECHANISM FOR LOOMS.

The Schedule referred to in these Letters Patent and making part ofthesame.-

To all whom it may coiwern Be it known that LEZEKIEL K. DAVIS, ofthecity and county of New York, and State of New York,

'have invented certain new and usefulv Improvements in the Jacquard-Mechanism of Looms; and Ido hereby declare that the following isa full and correct description thereof, reference being had to theaccompanyin g drawings, and to the letters of reference thereon.

My invention relates to mechanism for operating the trap-boards, inconnection with an ascending and descending suspension-board; andconsists in the arrangement and combination, with the suspension-boardand trap-boards, of' two T-levcrs, one on each side of the jacquard, inmanner and for the purposes hereinafter more fully described; also, in.operating the card-prism, by means of a combination otl the arm of theT- lever, which operates the suspension-board, and a cam, or bent arm,attached to the rock-shaft, which reciprocates the card-prism.

Figure 1, of the drawings, represents a side elevation of a jacquard,withl my improvements applied thereto.

Figure 2, a plan View of the same.

Letter a represents the frame of the jacquard.

b, the suspension-board.

c c', the two trap-boards.

In this form. of jacquard, the shed is opened froml the middle, bysimultaneously raising and loweling the wal-ps, the suspension-boardmoving downward to lower the warps not trapped by the ascendingtrapboard; and it is necessary that the suspension-board should notbegin to move downward until the ascending trap-board has trapped, andbegun to lift the warpthreads selected for it by the pattern-card, whenthe suspension-board must move down `quickly, to make up for the timethus lost by waiting for the ascending trap-board to secure itswarp-threads This combination of motions is produced in a very simplemanner by the first part of my said invention, as follows:

Letters d d are two T-levers, one at each side of the jacquard, and bothattached to a horizontal rockshaft, e, which rocks .in suitable bearingson the under side of the frame. Y

The T-levers have each two short arms, in line with eachother, connectedrespectively to the two trapboards, by links ff1 f 2 f 3, in such mannerthat when the arms are horizontal, the-two trap-boards are in` the samehorizontalplane.

The central arms of the T-levers are about twice the length of the twoshort arms, and are connected to the suspension-board by links h h', insuch manner that when the two trap-boards are in the same horizontalplane, the links and arms of the T-levers connected with thesuspension-boards are vertically in line with the rock-shaft and pointof connection with the suspension-board.

' It follows, from this construction, as will be obvious from aninspection of the drawings, that when the ascending trap-board begins torise to trap and secure its cords, the suspension-board hasnoappreciable motion, because its levers and links are in line', and arejust moving olii` the centre, while the levers and links operating thetrap-boards are at right angles, and are moving at their quickest speed.The speed of the trap-boards gradually diminishes, while that of thesuspension-board increases, until the motion is arrested and reversed,and the greater length of the arms of the T-levers, which operate thesuspensionboard, causes it to be moved the required distance in time.

. The rock-shaft and T-levers may receive motion from the loom by meansof the adjustable arm j, attached to the rock-shaft, and aconnecting-rod, k, shown broken ofi', .but to be connected with theloom` as usual'in jacquard looms..

The card-prism rm turns in bearings at the end of horizontal slidingbars m m2, which are connected to the two arms m3 m of a horizontalrock-shaft, n.

This rock-shaft n, which imparts reciprocating movement to thecard-prism, is actuated by the upright armkf one of the T-levers,through a bent arm, jp, attached'to the rock-shaft n, which extendsacross the side frame, and bends up like a cam, to be actuated by therounded surface of the lower end of the link, which connects the uprightarm of the T-lever with the suspension-boarrhas shown in the drawings;or it may be operated by a pin, placed in the upright arm of theT-lever, just below the link-connection.

A spring, g, reacts the bent lever, and keeps it in contact with theactuating-surface of the T-lever.

I claim, as of my invention and improvement in jacquard-mechanism- TheT-levers, 1n combination with the suspension# `board and trap-boards,when arranged and constructed so as to produce the mode of operationhereinbefore described.

Also, in combination with the card-prism and its.Areciprocating-meelianism, the bent arm p and the T- Y lever, arrangedand constructed to operate in the manner described.

' EZEKIEL- K. DAVIS.-

Witnesses:v z

F. G. TREADWELL, Jr., JOSEPH CAMPBELL.

